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Talc is a very important industrial mineral. Talc is used in many industries, including paper making, plastic, paint and coatings (e.g. for metal casting molds), rubber, food, electric cable, pharmaceuticals, cosmetics, and ceramics. Talc is crushed into powder to form talcum powder, which is the main ingredient in many cosmetics as well as some baby powders. Talc is also used as an ornamental stone, being carved into figures, jewellery boxes, tiling, and art sculptures. Since it is so soft, it is very easily cut and carved.

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Talc, or talcum, is a clay mineral, Talc dominantly forms from the metamorphism of magnesian minerals such as serpentine, pyroxene, amphibole, and olivine, in the presence of carbon dioxide and water. This is known as "talc carbonation" or "steatization" and produces a suite of rocks known as talc carbonates.

Talc is primarily formed by hydration and carbonation by this reaction:

dolomite 3CaMg(CO3)2 + silica 4SiO2 + waterH2O → talc Mg3Si4O10(OH)2 + calcite 3CaCO3 + carbon dioxide 3CO2

Talc can also be formed via a reaction between dolomite and silica, which is typical of skarnification of dolomites by silica-flooding in contact metamorphic aureoles:

dolomite 3CaMg(CO3)2 + silica 4SiO2 + waterH2O → talc Mg3Si4O10(OH)2 + calcite 3CaCO3 + carbon dioxide 3CO2

Grade A	Grade B	Grade C	Grade D	Grade E
Brightness >90%	Brightness 85%-90%	Brightness 80%-85%	Brightness 75%-80%	Brightness 70%-75%
CaO levels <10%	CaO levels <5%	CaO levels <3%	CaO levels <2%	CaO levels <2%

Basic Chemical Analysis :

Sr. No	Parameters	Talc Grade
1	MgO	29.5%
2	SiO ₂	61.5%
3	Fe ₂O ₃	2.56%
4	CaO	0.56%
5	Soluble Salts	0.55%
6	Al ₂O ₃	0.55%
6	PH(at 10%)	8.5 - 9.5

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Talc (Soap Stone)

Soap Stone / Talc

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Talc is primarily formed by hydration and carbonation by this reaction:

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